Note: EPA no longer updates this information, but it may be useful as a reference or resource.
Please see www.epa.gov/nsr for the latest information on EPA's New Source Review program.
July 7, 1986 Prevention of Significant
Deterioration (PSD) Definition of "Modification" 4.32
The memo discusses why a major
modification would result from the
replacement of wet scrubbers with
baghouses that would improve control of
particulate matter, but allow a
significant net increase of sulfur
dioxide emissions. The proposed change
would be subject to PSD review. The memo
also discusses whether the modification
requires review under NSPS regulations.
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